package com.kuang.service;


import org.apache.ibatis.annotations.Param;

public interface UserService {
    //查询是否有此用户
    String selectUsername(String username);
    //根据用户名查询密码
    String selectPasswordByUsername(String username);

    //根据username查询所有的usage_id
    int selectUsageIdByUsername(String username);

}
